See extra_arguments, extra_keywords below
derivative can assume that input and output are
ndarrays.
Note that the output from derivative is modified inplace;
be careful to copy important inputs before returning them.

output : array, optional

The output parameter passes an array in which to store the
filter output.

mode : {‘reflect’,’constant’,’nearest’,’mirror’, ‘wrap’}, optional

The mode parameter determines how the array borders are
handled, where cval is the value when mode is equal to
‘constant’. Default is ‘reflect’

cval : scalar, optional

Value to fill past edges of input if mode is ‘constant’. Default
is 0.0